Poster sessions closing before their advertised date

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I was submitted a proposal to a conference (submissions were asked to be submitted by today), before looking at the conference website. Apparently the panel to which I submitted my proposal is 'full'....
I don't understand why there is an advertised closing date if the spots are to be doled out in advance of it!! Has anyone else had this problem?
My I seem to be doing alot of wingeing!!
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